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Joyce wrote: "Ineluctable modality of the visible: at least that if no more, thought through my eyes. Signatures of all things I am here to read."

However, the coin contains a surplus "that" in the second sentence.

The Central Bank said that the coin was an artistic representation of the author and the text, and was not intended as a literal representation.

It also said that it accepted there was an issue with its internal processes and was reviewing those processes.

The coin remains on sale, but the Central Bank said it will inform purchasers of the error in advance.

Anyone who has already bought the coin and wishes to return it, will be given a full refund of the €46 purchase price.

Samuel Beckett, who transcribed Finnegans Wake for Joyce, often told the story of how during one bout of dictation, Joyce responded to a knock on the door with "Come in!". Beckett said he transcribed the phrase and Joyce left the extra words in the book.